| trifocal |
Trifocals are eyeglasses where the lenses have 3 regions to correct for distance, intermediate (arm's length), and near vision. They are mostly used by people with advanced presbyopia who've been prescribed 2 diopters or more of reading addition. The intermediate addition is normally half the reading addition. ...
출처: en.wikipedia.org/wiki/Trifocal
|
|---|---|
| trifocal |
Having three powers in separate areas on the same lens. Usually a more positive correction toward the bottom of the lens. This second and third value are sometimes listed as the "push"
출처: www.geocities.com/likeglass55/glossary.html
|
| trifocal |
A lens design that has three focal areas: a lens for close work or reading, a lens for mid-distance viewing or arm's length, and a lens for faraway viewing or driving.
출처: www.allaboutvision.com/resources/glossary-3.htm
|
| trifocal |
A lens having two added powers in the form of a segment or segments.
출처: www12.mawebcenters.com/coltslaboratories/gloss.ivn...
|
| trifocal |
(TRI-foh-kul). Eyeglass lens that incorporates three lenses of different powers. The main portion is usually focused for distance (20 ft.), the center segment for about 2 ft., and the lower segment for near (14 in.).
출처: www.eyeglossary.net/
|